Introduction to Genetic Analysis 40

Introduction to Genetic Analysis 40 - 44200_02_p27-72...

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39 2.1 Autosomal inheritance the gametic proportions produced by the dihybrid; in other words, These proportions were the result that he obtained, perfectly consistent with his expectations. He obtained similar results for all the other dihybrid crosses that he made, and these and other types of tests all showed that he had in fact devised a robust model to explain the in- heritance patterns observed in his various pea crosses. The type of cross just considered, of an individual of unknown genotype with a fully recessive homozygote, is now called a testcross. The recessive individual is called a tester. Because the tester contributes only recessive al- leles, the gametes of the unknown individual can be de- duced from progeny phenotypes. In the early 1900s, Mendel’s principles were tested in a wide spectrum of eukaryotic organisms. The results of these tests showed that Mendelian principles were generally applicable. Mendelian ratios (such as 3:1, 1:1, 9:3:3:1, and 1:1:1:1) were extensively reported, sug-
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This note was uploaded on 01/10/2011 for the course BIOL BIOL taught by Professor Johnson during the Spring '08 term at Aberystwyth University.

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